BugLink: https://bugs.launchpad.net/bugs/1813869

When mac spoof is enabled in userspace and scan gets triggered with custom
mac address, driver is not handling custom mac addresses properly and
causing kernel crash. This could be fixed by copying custom mac addess to
mac address.

...skipping...
[ 49.130185] BUG: unable to handle kernel NULL pointer dereference at 0000000000000134
[ 49.138969] IP: [<ffffffffc0517c03>] rsi_prepare_mgmt_desc+0xd3/0x2d0 [ven_rsi_91x]
[ 49.147555] PGD 0
[ 49.149799] Oops: 0000 [#1] SMP
[ 49.244030] CPU: 0 PID: 31 Comm: kworker/u4:1 Not tainted 4.4.0-139-generic #165-Ubuntu
[ 49.252988] Hardware name: Dell Inc. Edge Gateway 3001/, BIOS 01.00.00 04/17/2017
[ 49.261374] Workqueue: rsi_scan_worker rsi_scan_start [ven_rsi_91x]
[ 49.357435] Stack:
[ 49.359675]  ffff88007542d7c0 ffff88005c290dd8 ffff880077894000 0000000000000000
[ 49.367971]  ffff8800747aa640 ffff88006928a500 ffff8800785e7d78 ffffffffc0516457
[ 49.376267]  00000046785e7d48 ffff8800778950e0 ffff8800747aa640 ffff880075438000
[ 49.384561] Call Trace:
[ 49.387307]  [<ffffffffc0516457>] rsi_send_probe_request+0x2c7/0x350 [ven_rsi_91x]
[ 49.395784]  [<ffffffffc0516702>] rsi_scan_start+0x222/0x380 [ven_rsi_91x]
[ 49.403486]  [<ffffffff818530c1>] ? __schedule+0x301/0x7f0
[ 49.409633]  [<ffffffff8109ee4b>] process_one_work+0x16b/0x490
[ 49.416164]  [<ffffffff8109f1bb>] worker_thread+0x4b/0x4d0
[ 49.422306]  [<ffffffff8109f170>] ? process_one_work+0x490/0x490
[ 49.429032]  [<ffffffff810a5587>] kthread+0xe7/0x100
[ 49.434589]  [<ffffffff818530c1>] ? __schedule+0x301/0x7f0
[ 49.440731]  [<ffffffff810a54a0>] ? kthread_create_on_node+0x1e0/0x1e0
[ 49.448042]  [<ffffffff81857bf5>] ret_from_fork+0x55/0x80
[ 49.454086]  [<ffffffff810a54a0>] ? kthread_create_on_node+0x1e0/0x1e0
Signed-off-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
Acked-by: Kleber Souza <kleber.souza@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>